Fizeau, Armand Hippolyte Louis (1819–1896)

Armand Hippolyte Louis Fizeau

Armand Fizeau was a French physicist, the first to determine with accuracy the speed of light in both air and water. Fizeau also took, with his scientific compatriot Foucault, the first clear photograph of the Sun. He researched the polarization of light, the expansion of crystals, and the Doppler effect, and looked for methods of increasing the life of the early photographs called daguerreotypes.